Question

A uniform metre scale of mass 0.2 kg is rotated about an
axis passing through its one end and perpendicular to its
length, at the rate of 60 revolutions/minute. What is its
kinetic energy of rotation? (use pie = 10)
(a) 3/4)
(b) 4/3)
(c) 2.5
(d) 0.5)​

Answer 1

Answer:

Moment of inertia I=

2

mr

2

=

2

10×0.2

2

=0.2 kgm

2

Angular acceleration α=

I

τ

=

0.2

10

=50 rad/s

2

Initial angular velocity w

i

=0

Using w

f

=w

i

+αt

Or w

f

=0+50×6=300 rad/s

Answer 2

Answer:

..................................:)

Explanation: